Question

At the end of the citric acid cycle, most of the energy remaining from the original glucose is stored in

A) CO₂.
B) pyruvate.
C) ATP.
D) NADH.
E) FADH₂.

Answer 1

At the end of the citric acid cycle, the majority of the energy from glucose is stored in NADH and FADH₂, the answer is D) NADH.

Step-by-step explanation:

At the end of the citric acid cycle, most of the energy remaining from the original glucose molecule is stored in NADH and FADH₂. These high-energy electron carriers play a crucial role in the subsequent stage of cellular respiration, the electron transport chain, where they donate their electrons to generate a substantial amount of ATP.

During the citric acid cycle, each turn produces three molecules of NADH and one molecule of FADH₂ from each acetyl CoA that enters the cycle. Since one molecule of glucose yields two molecules of acetyl CoA, this results in six NADH and two FADH₂ for the full oxidation of one glucose molecule. Thus, the correct answer to the question is D) NADH.